Country of the buyer's address as a two-letter ISO 3166-1 code. The only mandatory field of the buyer address at EN 16931 level.
cac:AccountingCustomerParty/cac:Party/cac:PostalAddress/cac:Country/cbc:IdentificationCodersm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:PostalTradeAddress/ram:CountryID Part of BG-8 Buyer postal address
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Semantics: EN 16931-1. Simplified explanation in our own words — the norm is authoritative.